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Electrochemistry and capillary condensation theory reveal the mechanism of corrosion in dense porous media

Corrosion in carbonated concrete is an example of corrosion in dense porous media of tremendous socio-economic and scientific relevance. The widespread research endeavors to develop novel, environmentally friendly cements raise questions regarding their ability to protect the embedded steel from cor...

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Autores principales: Stefanoni, Matteo, Angst, Ueli M., Elsener, Bernhard
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5943290/
https://www.ncbi.nlm.nih.gov/pubmed/29743576
http://dx.doi.org/10.1038/s41598-018-25794-x
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author Stefanoni, Matteo
Angst, Ueli M.
Elsener, Bernhard
author_facet Stefanoni, Matteo
Angst, Ueli M.
Elsener, Bernhard
author_sort Stefanoni, Matteo
collection PubMed
description Corrosion in carbonated concrete is an example of corrosion in dense porous media of tremendous socio-economic and scientific relevance. The widespread research endeavors to develop novel, environmentally friendly cements raise questions regarding their ability to protect the embedded steel from corrosion. Here, we propose a fundamentally new approach to explain the scientific mechanism of corrosion kinetics in dense porous media. The main strength of our model lies in its simplicity and in combining the capillary condensation theory with electrochemistry. This reveals that capillary condensation in the pore structure defines the electrochemically active steel surface, whose variability upon changes in exposure relative humidity is accountable for the wide variability in measured corrosion rates. We performed experiments that quantify this effect and find good agreement with the theory. Our findings are essential to devise predictive models for the corrosion performance, needed to guarantee the safety and sustainability of traditional and future cements.
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spelling pubmed-59432902018-05-14 Electrochemistry and capillary condensation theory reveal the mechanism of corrosion in dense porous media Stefanoni, Matteo Angst, Ueli M. Elsener, Bernhard Sci Rep Article Corrosion in carbonated concrete is an example of corrosion in dense porous media of tremendous socio-economic and scientific relevance. The widespread research endeavors to develop novel, environmentally friendly cements raise questions regarding their ability to protect the embedded steel from corrosion. Here, we propose a fundamentally new approach to explain the scientific mechanism of corrosion kinetics in dense porous media. The main strength of our model lies in its simplicity and in combining the capillary condensation theory with electrochemistry. This reveals that capillary condensation in the pore structure defines the electrochemically active steel surface, whose variability upon changes in exposure relative humidity is accountable for the wide variability in measured corrosion rates. We performed experiments that quantify this effect and find good agreement with the theory. Our findings are essential to devise predictive models for the corrosion performance, needed to guarantee the safety and sustainability of traditional and future cements. Nature Publishing Group UK 2018-05-09 /pmc/articles/PMC5943290/ /pubmed/29743576 http://dx.doi.org/10.1038/s41598-018-25794-x Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Stefanoni, Matteo
Angst, Ueli M.
Elsener, Bernhard
Electrochemistry and capillary condensation theory reveal the mechanism of corrosion in dense porous media
title Electrochemistry and capillary condensation theory reveal the mechanism of corrosion in dense porous media
title_full Electrochemistry and capillary condensation theory reveal the mechanism of corrosion in dense porous media
title_fullStr Electrochemistry and capillary condensation theory reveal the mechanism of corrosion in dense porous media
title_full_unstemmed Electrochemistry and capillary condensation theory reveal the mechanism of corrosion in dense porous media
title_short Electrochemistry and capillary condensation theory reveal the mechanism of corrosion in dense porous media
title_sort electrochemistry and capillary condensation theory reveal the mechanism of corrosion in dense porous media
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5943290/
https://www.ncbi.nlm.nih.gov/pubmed/29743576
http://dx.doi.org/10.1038/s41598-018-25794-x
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